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You are here:Home » Antibodies » Antibodies-Complement » Anti -Complement C4d

Anti -Complement C4d


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Clone Host Grade Applications
Monoclonal Mouse Affinity Purified E B IH
Complement factor C4 (MW 41kD), formerly known as Gg protein, consists of an alpha-, beta- and gamma-chain. The classical pathway of complement and the mannose binding lectin (MBL) activation pathway converge at C4. Activated C1, MASP-1 and MASP-2 cleave C4 resulting in the formation of C4a and C4b. The latter can be cleaved by factor I resulting in C4c and C4d, in which step all functional sites are lost.
The C4d activation fragment of C4 is an excellent marker for classical complement pathway and MBL pathway activation. The thioester formed between the side chains of Cys1010 and Gln1013 within the C4d region of the alpha-chain mediates covalent attachment to the target surface bearing activated forms of C1s or MASP.
Furthermore, C4d is highly homologous to C3d with over 35% shared amino acid sequence. In a number of diseases such as rheumatoid arthritis (RA), hereditary angioedema (HAE), systemic lupus erythematosus (SLE) and chronic urticaria with hypercomplementemia levels of C4d are significantly elevated in serum or plasma. C4d levels may also be elevated in plasma from patients with a variety of humoral autoimmune diseases in which complement activation is known to occur. Deposition of C4d in peritubular capillaries has been shown to be a sensitive marker for antibody-mediated (humoral) rejection in renal transplant biopsies.
Catalog #C7850-18K
ApplicationsSuitable for use in ELISA, Western Blot and Immunohistochemistry. Other applications have not been tested.
Recommended Dilutions
Western Blot: 1:50
Immunohistochemistry (frozen): 1:50
Optimal dilutions to be determined by the researcher.
Storage and StabilityMay be stored at 4°C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
Clone TypeMonoclonal
Clone No12D11
FormSupplied as as liquid in PBS, 0.1% BSA, 0.02% sodium azide.
PurityPurified by Protein G affinity chromatography.
ImmunogenC4d (alpha 2 chain), C4b and C4
SpecificityRecognizes C4, C4b and C4d. Recognizes an epitope on the alpha 2 chain of C4d. Species Crossreactivity: human, porcine, bovine, baboon and rhesus monkey.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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